Home / 138,825.18-191,582.64-78,404.85

Finding the Fourth Proportional to 138,825.18, 191,582.64 and 78,404.85

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Solution

The fourth proportional to 138,825.18, 191,582.64 and 78,404.85 is: 108,200.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,825.18 : 191,582.64 = 78,404.85 : x
  2. Step 2: Convert to fraction form
    138,825.18/191,582.64 = 78,404.85/x
  3. Step 3: Cross multiply
    138,825.18x = 191,582.64 × 78,404.85
  4. Step 4: Simplify right side
    138,825.18x = 15,021,008,151.80
  5. Step 5: Solve for x
    x = 15,021,008,151.80/138,825.18
  6. Step 6: Final answer
    x = 108,200.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.